Tornado season has gotten off to a deadly beginning. A huge so-called wedge tornado came barreling down around 7:30 p.m. on Sunday evening on Mayflower, Arkansas, with 10 deaths there and six more across the state, said the Arkansas Department of Emergency Management on its website. It’s the year’s worst tornado outbreak so far, with meteorologists listing 31 tornado reports on Sunday alone.

Amateur and storm-chasing videos helped bring home the horror of the Mayflower tornado, which grew to a half-mile wide and caused destruction along a path reportedly dozens of miles long. The term “wedge” refers to a tornado in which the funnel appears almost as wide on the ground as it is tall. While the biggest damage so far has been reported in Mayflower, twisters also hit Vilonia, Arkansas. Baxter Springs, Kansas also saw a twister, while one person was killed in Keokuk County in Iowa, and another in Quapaw, Oklahoma.

An aeriel drone video of the Arkansas tornado posted by Briam Emfinger, a storm-chaser and photographer for ABC affiliate KATV, was circulating widely online. That video showed showed devastation around Mayflower where some 20 businesses and more than 50 homes have been leveled. The Associated Press reported that state troopers were going through cars, trucks and 18-wheel trucks that were toppled along a two-mile stretch of the Interstate 40 highway.

The twisters hit not far off the anniversaries of the May 20, 2013 tornado in Moore, Oklahoma, which killed 24 people, and the May 22, 2011 tornado in Joplin, Missouri, causing the death of at least 162 persons. But Sunday also marked three years since a 122-tornado day that hit Mississippi, Tennessee, Virginia and Georgia, which saw 316 fatalities. Forecasters have been warning for several days of a storm hitting the Midwest this weekend, but Monday could see more dangerous weather.

Meteorologist Bill Karins on MSNBC says some 28 million people, from central Illinois southward to Mississippi, stand in the prospective path of severe weather and potentially tornadic activity Monday.

Here are more pictures that have tweeted out from this latest run of storms:

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